fix: remember selection on rebuild of network selector

Author: ice-priapus

lib/app/features/wallets/views/pages/coins_flow/coin_details/coin_details_page.dart

@@ -40,9 +40,11 @@ class CoinDetailsPage extends HookConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final walletView = ref.watch(currentWalletViewDataProvider).requireValue;
     final coinsGroup = walletView.coinGroups.firstWhere((e) => e.symbolGroup == symbolGroup);
-    final networkSelectorData = ref.watch(
-      networkSelectorNotifierProvider(symbolGroup: symbolGroup),
-    );
+    final networkSelectorData = ref
+        .watch(
+          networkSelectorNotifierProvider(symbolGroup: symbolGroup),
+        )
+        .valueOrNull;
     final history = ref
         .watch(
           coinTransactionHistoryNotifierProvider(symbolGroup: symbolGroup),

lib/app/features/wallets/views/pages/coins_flow/coin_details/components/balance/balance.dart

@@ -58,6 +58,7 @@ class Balance extends ConsumerWidget {
                     .read(
                       networkSelectorNotifierProvider(symbolGroup: coinsGroup.symbolGroup),
                     )
+                    .valueOrNull
                     ?.selected
                     .mapOrNull(network: (network) => network.network);
                 final wallet = ref
@@ -84,6 +85,7 @@ class Balance extends ConsumerWidget {
                     .read(
                       networkSelectorNotifierProvider(symbolGroup: coinsGroup.symbolGroup),
                     )
+                    .valueOrNull
                     ?.selected
                     .mapOrNull(network: (n) => n.network);
 

lib/app/features/wallets/views/pages/coins_flow/coin_details/providers/balance_provider.r.dart

@@ -27,7 +27,7 @@ class CoinBalanceNotifier extends _$CoinBalanceNotifier {
   CoinBalanceState build({required String symbolGroup}) {
     final currentNetwork = ref.watch(
       networkSelectorNotifierProvider(symbolGroup: symbolGroup).select(
-        (state) => state?.selected.whenOrNull(network: (network) => network),
+        (asyncState) => asyncState.valueOrNull?.selected.whenOrNull(network: (network) => network),
       ),
     );
 

lib/app/features/wallets/views/pages/coins_flow/coin_details/providers/coin_transaction_history_notifier_provider.r.dart

@@ -82,7 +82,7 @@ class CoinTransactionHistoryNotifier extends _$CoinTransactionHistoryNotifier {
 
     _network = ref.watch(
       networkSelectorNotifierProvider(symbolGroup: symbolGroup).select(
-        (state) => state?.selected.whenOrNull(network: (network) => network),
+        (asyncState) => asyncState.valueOrNull?.selected.whenOrNull(network: (network) => network),
       ),
     );
 

lib/app/features/wallets/views/pages/coins_flow/coin_details/providers/network_selector_notifier.r.dart

@@ -9,7 +9,7 @@ part 'network_selector_notifier.r.g.dart';
 @riverpod
 class NetworkSelectorNotifier extends _$NetworkSelectorNotifier {
   @override
-  NetworkSelectorData? build({required String symbolGroup}) {
+  Future<NetworkSelectorData?> build({required String symbolGroup}) async {
     final networksValue = ref
         .watch(
           syncedCoinsBySymbolGroupProvider(symbolGroup),
@@ -25,20 +25,32 @@ class NetworkSelectorNotifier extends _$NetworkSelectorNotifier {
       ...wrappedNetworks,
     ];
 
+    // Get previous selection from state (safe with valueOrNull in async providers)
+    final previousState = state.valueOrNull;
+    final previousSelection = previousState?.selected;
+
+    // Preserve previous selection if it's still valid, otherwise use first item
+    final selectedItem = previousSelection != null && items.contains(previousSelection)
+        ? previousSelection
+        : items.first;
+
     return NetworkSelectorData(
       items: items,
-      selected: items.first,
+      selected: selectedItem,
     );
   }
 
   set selected(SelectedNetworkItem item) {
+    final currentState = state.valueOrNull;
+    if (currentState == null) return;
+
     final canUpdate = item.map(
-      network: (item) => state?.items.contains(item) ?? false,
+      network: (item) => currentState.items.contains(item),
       all: (_) => true,
     );
 
     if (canUpdate) {
-      state = state!.copyWith(selected: item);
+      state = AsyncData(currentState.copyWith(selected: item));
     }
   }
 }

lib/app/features/wallets/views/pages/coins_flow/coin_details/providers/selected_crypto_wallet_notifier.r.dart

@@ -16,7 +16,7 @@ class SelectedCryptoWalletNotifier extends _$SelectedCryptoWalletNotifier {
   SelectedCryptoWalletData build({required String symbolGroup}) {
     final network = ref.watch(
       networkSelectorNotifierProvider(symbolGroup: symbolGroup).select(
-        (state) => state?.selected.whenOrNull(network: (network) => network),
+        (asyncState) => asyncState.valueOrNull?.selected.whenOrNull(network: (network) => network),
       ),
     );